<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in goodList" :key="index">
          <th><input type="checkbox" v-model="item.checked" /></th>
          <th>{{ item.name }}</th>
          <th>{{ item.price }}</th>
          <th>
            <button @click="btnClick(-1, item)">-</button>{{ item.num }}
            <button @click="btnClick(1, item)">+</button>
          </th>
          <th>{{ item.num * item.price }}</th>
          <th><button @click="delFn(item.name)">删除</button></th>
        </tr>
      </tbody>
      <foot></foot>
    </table>
  </div>
</template>

<script>
import { mapState, mapMutations } from 'vuex'
import Foot from '@/components/foot.vue'

export default {
  components: {
    Foot
  },
  computed: {
    ...mapState(['goodList']),
    isAll: {
      get () {
        return this.goodList.every((item) => item.checked === true)
      },
      set (val) {
        this.goodList.forEach((item) => (item.checked = val))
      }
    }
  },

  methods: {
    ...mapMutations(['updateNum', 'delNum']),
    btnClick (num, item) {
      const newCount = item.num + num
      if (newCount < 1) return
      this.updateNum({
        name: item.name,
        num: newCount
      })
    },
    delFn (name) {
      this.delNum({
        name: name
      })
    }
  }
}
</script>

<style></style>
